Metal-cutting saw.



W. ILLUGAS. METAL CUTTING SAW.

` T Patented Och-26,1909.

'UNrrnn s'rnrns PATENT onmon. A

WILLIAM H. LUCAS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO FRED F. ESPEN,

JACOB ESPEN, JR., AND WILLIAM H. LUCAS, ALL OF PHILADELPHIA, PENNSYLVANIA.

METAL-CUTTING SAW.

Application filed September 16, 1908.

To all whom 'it may concern:

Be it known that I, WiLLIAM H. LUCAS, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented jected to substantially uniform strain, canv be quickly and accurately sharpened by grinding when they become dull, and will remove the metal in the form of short curled shavings which will have no tendency to clcg the teeth.

n the accompanying drawing Figure l is a side view of part of a circular metal cutting saw with teeth in accordance with my invention; Fig. 2 is an enlarged section on the line a-cz, Fig. l; Fig. 3 is an enlarged section on the line 5 5, Fig. l, and Fig. 4 is an enlarged sectional view showing the relation to each other of the successive teeth of the saw.

Each tooth of the saw is without lateral bend or set, and has a front face l, a peripheral or cutting face 2, and a rear face 3, the front face of the tooth being inclined rearwardly at an angle of about lifteen degrees from a radial line, the peripheral or cutting face 2 having the angle necessary for clearance and the rear face 3 being on an angle dependent upon the distance apart of the teeth of the saw.

Each of the peripheral portions 2 of each tooth has a substantially lat cutting face 4, slightly beveled at the outer corner, as shown at 5, and a beveled or non-cutting face 6, the cutting faces of alternate teeth being reversely arranged, as shown in Fig. 4, and each of such cutting faces extending from one outer face of the saw blade to or beyond the middle of the blade, whereby each tooth makes one-half of the full cut, the work being thereby distributed so as to facilitate the cutting operation and provide for rapid action of the saw without undue strain upon the teeth of the same.

Specification of Letters Patent.

Patented Oct. 26, 1909.

Serial No. 453,321.

Because of the laterally contracted cutting face presented by each tooth of the saw in connection with the undercut front face of the tooth the cuttings made by each tooth are in the form of thin and narrow curled shavings which readily free themselves from the throat of the tooth and prevent any clogging of the same, and by reason of the fact that the beveled sides of the peripheral portions of the teeth are disposed alternately right and left the sharpening of the teeth by grinding is readily accomplished by means of a swinging emery wheel acting iirst on one side of the saw and then on the opposite side of the same, the saw being moved forwardly to the extent of one tooth between successive actions.

The beveling of the outer corner of the' cutting face of each tooth prevents the formation of a sharp point on said cutting face and this portion of the tooth cannot therefore break down under strain, and impair the cutting action as it would if such a sharp point was presented. The beveled or noncutting face of each tooth is of the saine width from front to rear in order to avoid the production of a wedge-shaped pocket located adjacent to the cutting face of the tooth and thereby lessen the tendency of the tooth to be clogged or jammed during the cutting operation.

I claim l. A metal cutting saw having, on the peripheral portion of each tooth, a substantially flat cutting face and a beveled or noncutting face, .the flat face being of substantially one-half the width of the tooth and the beveled face being of the same width from front to rear, the bevel of one tooth being on the right hand side and of the neXt tooth on the left hand side throughout the series of teeth.

2. A metal cutting saw having teeth with peripheral portions each presenting a substantially flat cutting face with slightly beveled outer corner, and a beveled or non-cutting face, the flat face being of substantially one-half the width of the tooth and the flat faces of the teeth being reversely disposed in successive teeth.

3. A metal cutting saw having teeth, each with an undercut front face and a peripheral portion presenting,` a substantially Het In testimony whereof, I 'have signed my cuttlng face Wlth shghtly beveled outer corname to thls speelcatlon, 1n the presence nel", and a beveled or non-euttlng face, the of two subsorlbmg Wltnesses.

flat face being of substantially one-half the VM. H. LUCAS. Width of the tooth and the flat faces of the ltnessesz n teeth being reversely disposed in successive HAMlLToN D. TURNER,

teeth. KATE A. BEADLE. 

